Stove with wick-type liquid fuel burner



Jul 4, 1950 Filed Dec. 21, 1945 w. B. ENGH ET AL STOVE WITH WICK-TYPE LIQUID FUEL BURNER 3 Sheets-Sheet 2 //v VENTO 25;

WALTEQ 5. E/vaH. CORTLAND l/V. DA v/s AZMMZZW HTTORNEY July 1950 w. B. ENGH ETAL 2,513,925

STOVE WITH WICK-TYPE LIQUID FUEL BURNER Filed Dec. 21, 1945 3 Sheets-Sheet 5 //vvE/v7'0/254 WKILTE/E' 5. ENGH.

CORTLAND W DAV/s.

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ATTORNEY Patented July 4, 1950 UNITED STATES OFFICE STOVE WITH WICKJIYPE LIQUID FUEL BURNER nois ApplicationDccember 21, 1945, Serial No. 636,537 14 Claims. (o1. 126-436) The invention pertains .to a stove for space heating purposes in which relatively heavy liquid fuel such as kerosene and the like may be used, the stove being constructed to efiectively burn the fuel without perceptible odor in the discharged gases, the heat of combustion being utilized in the stove in a manner to radiate a large percentage of the heat laterally from the stove into the space to be heated thereby.

The stove structure includes a tubular casing of sheet metal which is in a vertical position when in use, which casing is mounted above a fuel reservoir provided with a burner of the tubular wick type for effectively burning the liquid fuel used. The casing is preferably connected with the reservoir by means of a horizontal pivot or hinge, at one edge of the'lower end of the easing, so that the casing may be moved to a horizontal position to clean the burner and wick and to facilitate lighting the stove. This position of the casing also facilitates replacement of the wick when necessary.

The. burner construction is provided with a central air passage extending vertically through the fuel reservoir to supply the inner air to the vaporized fuel, that is requiredfor the burning of the fuel, and a burner cone is provided for directing outer air against the vaporized fuel arising from the wick, with suflicient velocity and in proper amount to penetrate and mix with the vaporized fuel and supply the air required in conjunction with the inner air, to completely burn all of the carbonaceous matter in the liquid fuel, so that the flame produced by the burner will not be a yellow flame indicating the presence of unburned carbonaceous matter, but will, on the other hand, be a purple or bluish flame showing complete combustion as far as the carbonaceous matter i concerned. The burner cone is in two parts, the lower .part being supported by the main structure of the burner and having an inper opening above the wick which is much too large for purposes of proper combustion. This lower cone portion permits access to the wick for cleaning and lighting purposes in a manner that is not possible where the burner cone is in a single piece. The burner cone also includes an upper part carried by the casing, so that when the casing is in a vertical position for use, the upper part of the burner cone rests upon the lower part thereof to complete the cone and provide an inner opening above the wick having a diameter of just the size required to properly supply outer air to the vaporized fuel with a velocity to penetrate the vaporized, .fllel and mix ,4. therewith and to at .the same time provide the proper quantity of outer air in conjunction with the inner air supplied to the vaporized fuel, to completely burn thecarbonaceous matter in the liquid fuel. The.- upper portion of the burner coneis loosely carried by the casing, and is provided with an annular offset portion registering with and fitting a similar portion on the lower part of the burner cone, so that when the casing is moved to its vertical position, said registering portions will center and accurately place the upper cone portion relatively to the wick so that outer air is uniformly supplied circumferentially to the vaporized fuel.

In view of the stove being used for space heat ing purposes and in many instances delivering the gases of combustion into the space heated by the stove, itis of the utmost importance that no disagreeable'odors or noxious gases shall be delivered to the heated space. With the burner construction thus far described, it has been found that although the carbonaceous matter in the fuel is apparently completely consumed or burned, because of the flame being of a purple or bluish color, products of combustion are apparently formed which are themselves combustible and. which if delivered into the heated space, impart disagreeable odors and possible noxious effects thereto. The invention provides means for eliminating these undesirable odors and effects, as belowdescribed, including an nnular passageway for auxiliary air, secured to the upper burner cone portion in'a horizontal plane, near said upper burner cone portion, which .passageway include an annular member provided with a central aperture somewhat larger invdiameter than "the diameter of the opening in the upper burner cone portion, said passageway being in free communication at its outer edge with the surrounding atmosphere, so that the action of the stove casing as a chimney will draw secondary air through said passageway, determinedby the vertical extent of said passageway, said sec} ondary air being delivered around the annular flame and in such close proximity to the flame that the inner portion of the resulting annular column of said secondary or auxiliary air commingles with the outermost portion of the annular flame. The result of this construction and operation is that the fumes and the still combustible gaseous products resulting from the burning of the fuel, are completely surrounded by said column of auxiliary air and cannot escape into the interior of the casing without passing through-the auxiliary air which is highly erties.

heated by the action of the flame, which produces the burning of said fumes and said stillcombustible gaseous products, so that disagreeable odors and noxious effects are eliminated from the gases discharged from the stove.

The stove construction includes an imperforate bafile of sheet metal horizontally'disposed in the casing about mid-way between the burner and the openings provided in the upper portion of the casing for the discharge of the gases of combus- 1O bar, to prevent moving the wick upwardly relation, said baffie having a diameter substantially larger than the diameter of the flame produced by the burner and being coaxially disposed with regard to the burner, a sufficient annular spacing being provided around the baffle inside of the so that they impinge forcibly against the side wall of the casing mid-way between the lower and upper portions of the casing, so that a highly heated band of the casing is provided around the baflie, which highly heated band in turn radiates heat to a corresponding degree into the air around 5 the stove, thus discharging a large part of the heat developed by the stove, laterally from the stove into the space heated by it; second, the annular column of highly heated gases of combustion flowing upwardly from the flame, surrounded by the annular envelope of auxiliary air, strikes the lower surfaceof. the baflie with considerable Velocity, which results in a thorough commingling of the gases of combustion produced by the annular flame, and the auxiliary air. The bafile, being directly over the. flame, is highly heated thereby and a temperature is maintained in the zone below the baffle which is sufficientto complete the burning of any fumes and still com bustible gaseous products that may not have been. 49

previously burned, and this insures the delivery ,from the outlet openings in the upper portion of the casing of the stove, of products of combustion free from odor and having no noxious prop- $3 The results described are secured without unduly cooling the fuel vapor and without appreciably decreasing the heating efficiency of the stove, by providing the said passageway for auxiliary air, with a vertical spacing or-extent,-, and with an internal opening no larger than 50 required to supply an amount of auxiliary air slightly in excess of that required to efiect the complete combustion of the fumes and still combustible products delivered from the flame of the burner.

The effective operation of the stove in the manner described, requires proper operation of the burner, and such operation is insured by the particular wick operating mechanism employed;

as a part of the burner construction. The tubular wick is provided, below its burning portion, with a thin sheet metal tubular carrier which is rigidly secured to the wick, said carrier having secured thereto a rack bar extending angularly ,7

and also axially of the carrier tube, so that the ternally a spur gear meshing with the rack bar,

said spur gear being substantially in a vertical plane and being rigidly secured to the inner end of a short horizontal shaft extending radially through the outer wick tube and rigidly carrying at its outer end an operating handle or disc.

The

4 outer wick tube has projecting inwardly therefrom suitable guide members to hold the rack bar in mesh with the spur gear. In this manner the raising and lowering of the wick is effected by both an angular movement and an axial movement, which operating condition is found to be much more effective and accurate than where it is attempted to operate the wick by axial movement only. To limit the movement of the wick, a stop is provided on the lower end of the rack tively to the burner beyond a desired extent, for example the lower. part of the rack bar may be suitably enlarged to prevent further relative movement between the rack bar and the spur gear. To prevent downward movement of the wick substantially below the position required to extinguish the flame, and low enough so that the wick might drop into the reservoir, the outer wick tube is provided with a stop member in the path of a lug carried bythe carrier tube of the wick, so that when the wick is moved downwardly until the lug engages the stop member, further downward movement of the wick is prevented. This. takes care of the requirements for oper ating the wick and the burner in place on the reservoir, and to facilitate renewing the wick, the present invention provides a construction of Stop member such that it does not function as a stop member when the burner is removed from the reservoir, or in other words, with the burner removed from the reservoir, the wick may be moved downwardly relatively to the burner, until it is entirely free from the burner and drops out, which greatly facilitates the operation of renew ing the wick. To accomplish this result, the stop member is mounted ona spring band secured to and extending partly around the inner surface of the outer wick tube, and said stop member is provided with an outwardly extending cam for engagement with the opening in the top of the reservoir made to receive the burner. The parts are so arranged that when the burner is removed from the reservoir, the spring action of the spring band moves the stop member outwardly from the path of movementof the lug carried by the carrier tube of thewick, and when the burner is placed in operating position on the reservoir, the cam referred to presses the stop inwardly against the spring action of the spring band and into the path of the lug carried by the carrier tube of the wick, to limit downward movement of the wick. In this manner the burner construction is made highly effective for operation to accurately secure the best heating results, without introducing any objectionable features in connection withits operation.

The invention will be best understood by reference to the accompanying drawings showing a preferred embodimentthereof, in which:

Fig. 1 is a. vertical, central, sectional View throughthe stove, V

Fig. 2 is a horizontal, sectional view of the burner of the stove taken along the line 2-2 in Figs. 1 and 3,

Fig. 3 shows in a view similar to that shown in Fig. l and to an enlarged scale,- the burner construction employed, excepting that in this View the wick and parts carried thereby are shown in front elevation, and the parts controlling the auxiliary air flow are shown raised from engagement with the burner,

Fig. 4 is a horizontal, sectional view of a part of the structure shown in Fig. 3, taken along the line 4- in Fig. 3,

the casing I Fig. shows in a view similar to "Fig. :and'to an enlarged scale, the position of the :stop mechanism for the wick when the burner is removed from the reservoir.

Fig. 6 shows in a view similar to Fig. .5, the stop mechanism for the wick in the position given it by mounting the burner ion the reservoir,

Fig. '7 shows in side elevation and to an enlarged scale, with most of the outer wick ztube removed, the wick and the parts carriedthereby, as Well as the stop for limiting downward movement of the wick, and

'Fig. 8 shows in a view similar to Fig. 3.,amodified form of auxiliary airpa-ssa'geway.

Similar numerals refer 'to similar :parts throughout the several views.

As shown in Fig. l, the stove consists of a tubular casing I mounted at its lower-end on a fuel reservoir -2 to which it is hinged at :3 at one edge of the lower end of the casing so that the casing may assume the vertical position for :use indicated in Fig. 1, or be moved to a horizontal position when it is desired to light the burner or clean the same or to remove the wick. A "spring catch 4 is employed to hold the casing 1 in vertical position against accidental movement away from that position. The reservoir ".2 is provided with downwardly extending'feet 5 resting in a drip pan 6 to which they are-secured by :suitable bayonet joint connections, the drip pan being spaced from the reservoir to permit the free flow of air around the lower edge of the reservoir and between the reservoir and "the drip pan 6, to supply the inner wick tube I extending vertically through the reservoir, with the inner air required to in part support combustion of the fuel vapor. The wick tube "I carries at its upper end a perforated flame spreader 8 'for directing the inner air outwardly into the fuel vapor delivered from the wick 9 surrounding the tube "I.

The burner includes an outerwick tube 10 supporting at its upper portion an annular member I I extending outwardly and supportingthe lower portion I2 of the burner cone of the burner. The member II is provided with an annular row of perforations Ila as indicated in thedrawings, to supply the requisite outer air to the burner cone.

The upper portion l3 of the burner :cone rests upon the portion I2 when the stove is in operation, and said upper portion is rigidly secured by studs M to a horizontally disposed annular member I5 which at its outer edge is provided with a tubular extension I6 "terminating at its upper edge in an outwardly flanged portion 11 contained in an annular groove formed by an annular angle member l8 rigidly secured to a cone shaped partition I9 diverging upwardly and rigidly and tightly secured at its upper edge to The lower edge of the partition I9 that extends around the tubular portion 16, is tubular in form as shown at 29, and is slightly spaced from the tubular portion -I-6to limit movement-of the annular member I5 and upper'burner cone portion I3, relatively to the partition I9. The parts are so proportioned that when the easing I is in vertical position, the upper burner cone portion I3 rests on the lower cone portion I2, with the flanged member I! raised above the lower portion of the partition I9, :the described structure preventing accidental displacement of the annular member I5 and attached parts relatively to the partition I9, when the casing -l is moved to its horizontal position.

Just above the midaportion vertically of the :casing I, an imperforate baffle 21 of sheet metal is mounted in horizontal position by a plurality of supporting bars 22 secured at their lower ends to the partition I9 and at'theupper ends to said baiile, the baffle being preferably circular and of sufficiently smaller diameter than the casing I to permit the free passage of gases of combustion around the baflie to the outlet openings 23 formed through the upper portion of the casing I. A handle 24 is provided for conveniently moving the stove from one location to another.

The casing! is provided just above the partition I9 with a sight opening 25 having a transparent covering 28 by which the condition of the flame may be observed during the operation of the stove, and below the partition 59 the casing I is provided with a hand opening 21 permitting convenient access to the operating handle 28 of the wick raising mechanism.

As shown in Fig. 3, the wick 9 is provided with a carrier tube 29 of thin sheet metal which is secured to said wick, and said tube has rigidly secured thereto a rack bar 39 extending circumferentially and axially of said tube so that the rack bar has a helical formation, said rack 'bar meshing with a spur gear 31 .substantially in a vertical plane and secured to the inner end of a short shaft 32 supported in horizontal and radial position by the outer wick tube Ill, and having the operating handle Or disc 28 rigidly secured to its outer end. Suitable guide pins or members 32a extend inwardly from the outer wick tube, to engage the rack bar 35 and hold it in mesh with the spur gear 3|, ('see Figs. 5, 6 and 7''). When the burner is mounted on the reservoir 2, an outwardly extending flange 33 rests upon the reservoir and has bayonet joint engagement with said reservoir as shown in Fig. 2-, to hold the burner in place, at which time a spring stop member '34 is held inwardly by a cam member 35 engaging the opening in the top of the reservoir '2, so that said stop member is in the path of a lug 36 carried by the carrier tube 29, to limit downward movement of the wick 9 by operation of the handle 28. This condition of the wick is more clearly illustrated in Fig. 6, and as illustrated in Fig. .5, when the burner is removed from the reservoir 2, the spring action of the stop member 34 moves said stop member from the path of the lug 5% so that the wick may move freely downwardly until it is entirely released from the burner.

As shown in Fig. i, the spring stop 34 comprises a strip of spring metal. carrying at its free end .and projecting through and outside of the tube I9, the cam member 35, said stop member being rigidly secured at its other end to the inner surface of the lower portion of the tube I9, so that the stop member may move freely inwardl to the position indicated in dotted lines .in a to its wick stopping position, when the burner ismounted on the reservoir. wick and the parts carried thereby. as well as the relation of the stop member to the lug on the carrier tube of the wick, are more clearly shown in Fig. '7 which also illustrates the manner of preventing extreme upward movement of the wick by the enlargement on the lower end of the rack bar 36 to prevent further relative move mentbetween the rack bar and the spur gear iii.

,maintain uniform spacing between the carrier tube 29 and the outer wick tube ID, to insure The relation of the I 'parts i I proper meshing of the spur gear 3| with the rack bar 30. In Fig. 3, the casing I is shown in part, together with the cone member 13 and the member l controlling the flow of auxiliary air to the exterior of the annular flame for the purposes referred to, the casing and attached parts being shown in this flgure at the beginning in their movement from the vertical position of the casing to its horizontal position, to more clearly illustrate the clearance opening inside of the lower burner cone portion l2 for-cleaning and lighting purposes, when the casing is moved to its horizontal position. This'flgure also illustrates the manner of supporting the said members l3 and [5 from the partition l9 against the possibility of displacement from proper aligning position with the lower burner cone portion l2, when the casing I is moved to its horizontal position.

The auxiliary air supply provided for by the members l3 and i5 in addition to securing the advantages above described, serves to a substantial extent to cool the parts of the burner and stove construction Without appreciably interfering with the heating efliciency of the stove.

In'constructing the stove, the height of the casing from the burner and above the partition l9'to the outlet openings 23 is important, to the end that a proper chimney or draft effect may be exerted upon the burner, in addition to producing-the influx of auxiliary air between the 3 and I5. In other words, with the construction described, the check draft effect of the inflowing air between the parts l3 and I5, does not reduce the chimney draft on the flame below its optimum value.

Where the draft on the flame is too great, the effect is to produce a relatively small visible flame of a steel blue color, and the combustion is frequently so vigorous as to produce a noisy effect similar to that produced by a blast lamp;

so this condition, although it produces complete combustion of the fuel, is undesirable on account of the noisy burning that is apt to be produced, and what is even more important, on ac count of the excess air cooling the products of combustion and resulting in ineflicient heating by means of the stove. On the other hand, where the draft on the flame is too small, the flame is relatively high and contains more or less yellow spots indicating incomplete combustion of the carbonaceous matter in the fuel, so that, although the burning is relatively slow and noiseless, this condition also produces ineflicient heating by the stove. When the draft on the flame fl .is correct in amount, both of the conditions referred to are avoided, the flame is of medium height and of a purplish or bluish color and free from yellow spots, indicating complete combustion of the carbonaceous matter in the fuel without the use of excess air, and efficient heating by the stove is the result. This illustrates the importance of producing a definite total draft by the casing of the stove, that will secure the correct amount of draft on the flame and that will at the same time induce the correct amount of In the practical operation 8 bined air introduced to the flame from the flame spreader: 8 and under the ,cone portions l2 and I3. Insuch cases it is found that the continuous envelope of air that is produced aroundthe-flame by the auxiliary air from under the annular member' l5, effects the complete burning of said small streamers of carbonaceous matter, and avoids the discharge of undesirable odors through the openings 23 at the top of the casingl, whereby the invention protects the user of the stove from undesirable effects, even in such cases of improper operation of the stove.

In Fig. 8 we illustrate a modified construction of auxiliary air passageway, in whichthe lower wall of said passageway is formed by an annular member 38 spaced. below the member l5 and above the upper cone portion 13, the members 38 and [3 being secured to the member I5 by studs [4 as-indicated. The spacing of the members l5 and 38 from each other, is such as to impart to the auxiliary air'passageway the optimum vertical extent required for most effective operation of the stove, said passageway being open to atmosphere at its outer edge. This construction may be used where it is desirable to have the auxiliary air passageway independent of the burner cone, and where it is desired to deliver the auxiliary air to the flame of the burner or to the gases of combustion, a small distance above the burner cone. In other respects, the stove and burner construction may be the same 'as above described. 1 In a practical embodiment of the invention described, the following. approximate dimensions were employed: The casing had a diameter of 10%", the vertical'distance from the top of the burner to the bottom of the outlet openings '23 was 15 /2", and the diameter of the baffl 2! was 6", said bafflebeing located 9%? above the-top of the burner. The wick had an outside diameter of 3 the diameter of the opening in the lower portion l2 of the burner cone was substantially 3%,", the diameter of the opening in the upper portion l3 of the burner cone'was substantially 3%", and the diameter of the opening in the annular member i5 was substantially 3%". With these dimensions and using kerosene as fuel, a highly heated band was produced on the casing around the baffle 2! having a height of about-3 or 4 and a temperature of about 600 the temperature of the casing at. its upper end portion being at the same time from 350 to 400 F., and the gases delivered from the outlet openings 23 were not hot "enough for cooking purposes. The effect of the highly heated band of the casing around thebafile 2! was to radiate a substantial amount of heat laterally from the stove to give a feeling of warmth to the space around the stove considerably before the entire space was heated by the stove. I

While We have shown our invention in the particular embodiment above described, we do not limit ourselves thereto as we may employ equivalents thereof without departing from the scope of the appended claims.

What We claim is: I 1. In a stove for heating purposes, the combination of a vertical tubular casing, a liquid fuel burner of the annular flame type at the lower portion of said casing, said casing having discharge openings throughits upper portion, said burner including means for supplying inner air to the flame of said burner and also including annular burner cone means for supplying outer air to'sai'd flame, a horizontally disposed annular porting said burner, a hinge connection between.

the edge of the lower end portion of said casing. and saidreservoir to permit tilting said. casing. away from said burner to afford. access thereto, said burner cone means having upper and lower portions separable from each other and provided respectively with smaller and larger central openings, and means rigidly securing said upper portion to said annular member and effecting a permanent vertical spacing between said upper portion and said annular member. 1

2. In a stove for heating purposes, the combination of a vertical tubular casing, aliquid fuel burner of the annular flame type at the lower portion of said casing, said casing having. dis? charge openings through its upper. portion, said burner including means forv supplying inner air to the flame of said burner andalso including annular burner cone means for supplying outer air to said flame, a horizontally disposed annular member mounted on said casing above. and spaced from said burner cone means and in cooperation with said burner cone means defining an annular auxiliary air passage open to atmosphere at its outer edge and at. its inner edge discharging around and adjacent to the inner air supply means. of said burner, a liquid fuel reservoir supporting said burner, a hinge connection. between.

the edge of the lower end portion of said casing. andv said reservoir to permit tilting said casing away from said burner to afford access thereto, said burner cone means having upper and lower.

portions separable from each other andprovided.

respectively withsmaller and larger central open.- ings, and means rigidly securingsaid upper portion to said annular member and effectinga permanent vertical spacing between said upper por.-- tion and said annular member, said upper and lower portions having engaging conformations laterally aligning themwith each-other. inoperation.

3. Ina stove for. heating purposes, thecombination of a vertical tubular casing having. discharge openings through its upper portion for products of combustion, a liquid fuel burner of. the annular. flame type at thelower portionof the casingand including a frame and means for supplyinginner air to the burner flame andv including also annular burner cone means forsupplying outer air to.

the burner flame, a liquid fuelreservoir supporting said burner and said casing, said burner cone means comprising separable upper and lower.por-,

tions closely engaging each other inuse and in use comprising in effect a single burner. cone, structure, said upper cone portion. being. readily removable from said lower cone portion for clean.-

ing purposes, an. imperforate partition attached.

to and extending inwardly from the, lower portion of said casing and having a central opening, substantially larger than the burner said stove. casing being movable away from. said reservoir for cleaning purposes, means loosely connecting.

said upper conev portion with. said partition adjacent said partition opening and, thereby, sup.- porting said upper cone portion from said partition when said leasing is moved to a, position away from said reservoir, and means supporting said lower cone portion from the frame of the 1.0 burner and thereby providing a stationary sup; port for said lowercone portion, said upper cone, portion having; a central opening which in use: surrounds the; burner andis of a size then supplying optimum' outer air to the burner flames said lower cone-.portion-having for cleaning pur-- poses a central opening substantially larger than the central opening in said upper cone portion, saidcone portions having in use interengaging conformations centering. the central opening in said upperv cone portion-relativel to the burner with said; cone portions closely engaging each other, whereby moving said leasing away from said reservoir moves saidupper cone portion away from, said lower cone-portion and affords ready access to thevburner through said lower cone portion. for cleaning: purposes,v and placing. said cas-- ing in. operative. position on said reservoir estab-a lishes saidcentered relation of said upper cone portion,

41. In astove for heating purposes, the come bination of a. vertical tubular. casing. having discharge openings through its upper portion for, products of combustion, a liquid fuel burner of.- the.- annular flame type. at the lower portionofi. the casing and including a frame. and means,- for supplying. inner air to the burner flame and. including also annular burner cone means for. supplying, outer air tov the burner. flame, a. liquid.- fuel. reservoir supporting said burner and said; casing,1said burner cone means. comprising sepa--. rahle upper and lower portions closely engaging? each other inuseand. in use comprising in effect. a. single burner cone structure, said upper cone; portion, beingreadily removable from said; lower. cone, portionfor: cleaningv purposes, an. imper-; fora-te partition, attached. to and extending in.- wardly from the lower portion of. said casingandhaving; acentral opening substantially larger; than, the burner, saidstove casing being movable away from said: reservoir for cleaning purposes, means-loosely connecting said upper cone portion with; said partition adjacent said partition open: inggand'th'erebysupporting saidz-upper cone por 45 tion;. from. said. partition when said casingmoved. to. a. position away from said reser.voir,.. meanssupporting v said: lower cone portion. from the frame of the burner and thereby providing; a stationary supportfor said. lower cone portion,

;saidupper cone portion. having. a. central. open.-

larger than the. central. opening in. saidv upper.v

cone portion, said cone. portions. having in. use interengaging conformationscenteri'ng the central opening in said upper. cone portion. relatively 1 to the burner with. saidv cone portions closely. engagingv each. other, said loosely. connecting means including: a vertically disposed tubular. element rigidly connected with said. upper cone portion and extending with a loose fit. througllj the opening in, said partition, a. flange extending; outwardly from the upper portion of said tubue lar element above said partition, and retaining. means. carried by. said partition and extending, in. spaced. relation. over said. flange and' limiting. movement of said" flange upwardly from said partition.

5. In a stove for heating; purposes,jthe com-' bination of a verticaltubular casing havingv dis,- charge openings through its upper portion for; products of combustion, a liquid fuel burnerof the annular flame type at. the lower portion of.

11'- the casing and including a, frame and means for supplying inner air to-the burner flame and including also annular burner cone means for supplying outer air to the burner flame, a liquid fuel reservoir supporting said burner and said casing, said burner cone means comprising separable upper and lower portions closely engaging each other in use and in use comprising in effect a-single burner cone structure, said upper cone portion being readily removable from said lower cone portion for cleaning purposes, an imperforate partition attached to and extending inwardly from the lower portion of said casing and having a central opening substantially larger than the burner, said stove casing being movable away from said reservoir for cleaning purposes, means loosely connecting said upper cone portion with said partition adjacent said partition opening and thereby supporting said upper cone portion from said partition when said casing is moved to a position away from said reservoir, means supporting said lower cone portion from the frame of the burner and thereby providing a stationary support for said lower cone portion, said upper cone portion havinga central opening which in use surrounds the burner and is of a size then supplying optimum outer air to the burner flame, said lower cone portion having for cleaning purposes a central opening substantially larger than the central opening in said upper cone portion, said cone portions having in use interengaging conformations centering the central opening in said upper cone portion relatively to the burner with said cone portions closely engaging each other, said loosely connecting means including a vertically disposed tubular element rigidly connected with said upper cone portion and extending with a loose fit through the opening in said partition, a flange extending outwardly from the upper portion of said tubular element above said partition, retaining means carried by said partition and extending in spaced relation over said flange and limiting movement of said flange upwardly from said partition, and a hinge connection between said casing and said reservoir limiting movement of said casing relatively to said reservoir to arcuate movement.

'6. In a stove for for heating purposes, the combination of a vertical tubular casing having discharge openings through its upper portion for products of combustion, a liquid fuel burner of the annular flame type at the lower portion of the casing and including a frame and means for supplying inner air to the burner flame and including also annular burner cone means for supplying outer air to the burner flame, a liquid fuel reservoir supporting said burner and said casing, said burner cone means comprising separable upper and lower portions closely engaging each other in use and in use comprising in effect a single burner cone structure, said upper cone portion being readily removable from said lower cone portion for cleaning purposes, an imperiorate partition attached to and extending inwardly from the lower portion of said casing and having a central opening substantially larger than the burner, said stove casing being movable away from said reservoir for cleaning purposes, means loosely connecting said upper cone portion with said partition adjacent said partition opening and thereby supporting said upper cone portion from said partition when said casing is moved to a position away from said reservoir, means supporting said lower cone portion from the frame of the burner and thereby'providing a stationary support for said lower cone portion, said upper cone portion having a central opening which in use surrounds the burner and'is of ainterengaging conformations centering the cen-' tral opening in said upper cone portion relatively to the burner with said cone portions closely engaging each other, said loosely connecting means including a first tubular element depending from the opening in said partition, a second tubular element rigidly connected with said upper cone portion and extending upwardly with a loose fit through said first tubular element, an upper end flange extending outwardly from the upper portion of said second tubular element above said partition, and retaining means carried by said partition and extending in spaced relation over said flange and limiting movement of said flange upwardly from said partition.

7. In a stove for heating purposes, the combination of a vertical tubular casing having discharge openings through its upper portion for products of combustion, a liquid fuel burner of the annular flame type at the lower portion of the casing and including a frame and means for supplying inner air to the burner flame and including also annular burner cone means for supplying outer air to the burner flame, a liquid fuel reservoir supporting said burner and said casing,

said burner cone means comprising separable upper and lower portions closely engaging each other in use and in use comprising in effect a single burner cone structure, said upper cone portion being readily removable from said lower cone portion for cleaning purposes, an imperforate partition attached to and extending inwardly from the lower portion of said casing and having a central opening substantially larger than the burner, said stove casing being movable away from said reservoir for cleaning purposes, means loosely connecting said upper cone portion with said partition adjacent said partition opening and thereby supporting said upper cone portion from said partition when said casing is moved to a position away from said reservoir, means supporting said lower cone portion from the frame of the burner and thereby providing a stationary support for said lower cone portion, said upper cone portion having a central opening which in use surrounds the burner and is of a size then supplying optimum outer air to the burner flame, said lower cone portion having for cleaning purposes a central opening substantially larger than the central opening in said upper cone portion, said cone portions having in use interengaging conformations centering the central opening in said upper cone portion relatively to the burner with said cone portions closely engaging each other, said loosely connecting means including a first tubular element depending from the opening in said partition, a second tubular element rigidly connected with said upper cone portion and extending upwardly with a loose flt through said first tubular element, an upper end flange extending outwardly from the upper portion of said second tubular element above said partition, retaining means carried by said partition and extending in spaced relation over said flange and limiting movement of said flange upwardly from said partition, and a hinge connection between 13 said'casing and said reservoir limiting movement of said casing relatively to said reservoir to armate movement.

8. In a stove for heating purposes, the combination of a vertical tubular casing having discharge openings through its upper portion for products of combustion, a liquid fuel burner of the annular flame type at the lower portion of the casing and including a frame and means for supplying inner air to the burner flame and including also annular burner cone means for supplying outer air to the burner flame, a liquid fuel reservoir supporting said burner and said casing, said burner cone means comprising separable upper and lower portions closely engaging each other in use and in use comprising in effect a single burner cone structure, said upper cone 7 portion being readily removable from said lower cone portion for cleaning purposes, an imperiorate partition attached to and extending inwardly from the lower portion of said casing and having a central opening substantially larger than the burner, said stove casing being movable away from said reservoir for cleaning purposes, means loosel connecting said upper cone portion with said partition adjacent said partition opening and thereby supporting said upper cone portion from said partition when said casing is moved to a position away from said reservoir, means supporting said lower cone portion from the frame of the burner and thereby providing a stationary support for said lower cone portion, said upper cone portion having a central opening which in use surrounds the burner and is of a size then supplying optimum outer air to the burner flame, said lower cone portion having for cleaning purposes a central opening substantially larger than the central opening in said upper cone portion, said cone portions having in use interengaging conformations centering the central opening in said upper cone portion relatively to the burner with said cone portions closely engaging each other, and a hinge connection between said casing and said reservoir limiting movement of said casing relatively to said reservoir to arcuate movement.

9. In a stove for heating purposes, the combination of a vertical tubular casing having discharge openings through its upper portion for products of combustion, a liquid fuel burner of the annular flame type at the lower portion] of the casing and including a frame and means for supplying inner air to the burner flame and including also annular burner cone means for supplying outer air to the burner flame, a liquid 'fuel reservoir supporting said burner and said casing, said burner cone means including separable upper and lower annular portions closely engaging each other in use and in use comprising in effect a single burner cone structure, said upper cone portion being readily removable from said lower cone portion for cleaning purposes, an imperforate partition attached to and extending inwardly from the lower portion of said casing and having a central opening substantially larger than the burner, said stove casing being movable away from said reservoir for cleaning purposes, a horizontally disposed annular member spaced above and rigidly secured to said upper cone portion and defining between said annular member and said upper cone portion an annular auxiliary air passage of fixed size and at its outer edge open to atmosphere "below said partition, means loosely connecting said upper cone portion and said horizontally disposed annular member with said partition and thereby supporting the same from said partition when said casing is moved to a position away from said reservoir, and means supporting said lower cone portion from the frame of the burner and thereby providing a stationary support for said lower cone portion, said upper cone portion having a central opening which in use surrounds the burner and is of a size supplying in use optimum outer air to the burner flame, said lower cone portion having for clean-'- ing purposes a central opening substantially larger than the central opening in said upper cone portion, said horizontally disposed annular member having a central opening coaxial with and at leastas large as the opening in said upper cone portion, said cone portions having in use interengaging conformations centering the opening in said upper cone portion relatively to the burner with said cone portions closely engaging each other, whereby moving said casing away from said reservoir moves said horizontally disposed annular member and said upper'cone portion away from said lower cone portion and affords ready access to the burner through said lower cone portion for cleaning purposes and at the same time maintains said fixed relation between said horizontally disposed annular member and said upper cone portion, and placing said casing in operative position on said reservoir establishes a centered relation of said horizontally'disposed annular member and said upper cone portion with said burner.

10. In a stove for heating purposes, the combination of a vertical tubular casing having discharge openings through its upper portion for products of combustion, a liquid fuel burner of the annular flame type at the lower portion of the casing and including a frame and means for supplying inner air to the burner flame and including also annular burner cone means for supplying outer air to the burner flame, a liquid fuel reservoir supporting said burner and said casing, said burner cone means including separable upper and lower annular portions closely engaging each other in use and in use comprising in effect a single burner cone structure, said upper cone portion being readily removable from said lower cone portion for cleaning purposes, an imperforate partition attached to and extending inwardly from the lower portion of said casing and having a central opening substantially larger than the burner, said stove casing being movable away from said reservoir for cleaning purposes, a horizontally disposed annular member spaced above and rigidly secured to said upper cone portion and defining between said annular member and said upper cone portion an annular auxiliary air passage of fixed size and at its outer edge open to atmosphere below said partition, means loosely connecting said upper cone portion and said horizontally disposed annular member with said partition and thereby supporting the same from said partition when said casing is moved to a position away from said reservoir, means supporting said lower cone portion from the frame of the burner and thereby providing a stationary support for said lower cone portion, said upper cone portion having a central opening which in use surrounds the burner and is of a size supplying in use optimum outer air to the burner flame, said lower cone portion having for cleaning purposes 'a central'opening substantially larger than the central opening in said upper cone portion, said 15 horizontally disposed annular member having a central opening coaxial with and at least as large as the opening in said upper cone portion, said cone portions having in use interengaging conformations centering the opening in said upper cone portion relatively to the burner with said some portions closely engaging each other, whereby moving said casing away from said reservoir moves said horizontally disposed annular mem.- her and said upper cone portion away from said lower cone portion and aiiords ready access to the burner through said lower cone portion for cleaning purposes and at the same time maintains said fixed relation between said horizontally disposed annular member and said upper cone portion, and placing said casing in operative position on said reservoir establishes a centered relation of said horizontally disposed annular member and said upper cone portion with said burner, said loosely connecting means including a vertically disposed tubular element rigidly connected with said upper cone portion and said horizontally disposed annular member and extending with a loose fit through the opening in said partition, a flange extending outwardly from the upper portion of said tubular element above said partition, and retaining means carried by said partition and extending in spaced relation over said flange and limiting movement of said flange upwardly from said partition.

11. In a stove for heating purposes, the combination of a vertical tubular casing having discharge openings through its upper portion for products of combustion, a liquid fuel burner of the annular flame type at the lower portion of the casing and including a frame and means 'for supplyin inner air to the burner flame and including also annular burner cone means for supplying outer air to the burner flame, a liquid fuel reservoir supporting said burner and said casing, said burner cone means including separable upper and lower annular portions closely engaging each other in use and in use comprising in effect a single burner cone structure, said upper cone portion being readily removable from said lower cone portion for cleaning purposes, an imperforate partition attached to and extending inwardly from the lower portion of said casing and having a central opening substantially larger than the burner, said stove casing being movable away from said reservoir for cleaning purposes, a horizontally disposed annular member spaced above and rigidly secured to said upper cone portion and defining between said annular member and said upper cone portion an annular auxiliary air passage of fixed size and at its outer edge open to atmosphere below said partition, means loosely connecting said upper cone portion and said horizontally disposed annular member with said partition and thereby supporting the same from said partition when said casing is moved to a position away from said reservoir, means supporting said lower cone portion from the frame of the burner and thereby providing a stationary support for said lower cone portion, said upper cone portion having a central opening which in use surrounds the burner and is of a size supplying in use optimum outer air to the burner flame, said lower cone portion having for cleaning purposes a central opening substantially larger than the central opening in said upper cone portion, said horizontally disposed annular member having a central opening coaxial with and at least as large as the opening in said upper cone portion, said cone portions having in use interengag ing conformations centering the opening in said upper cone portion relatively to the burner with said cone portions closely engaging each other, where-' by moving said casing away from said reservoir moves said horizontally disposed annular memher and said upper cone portion away from said lower cone portion and affords ready access, to the burner through said lower cone portion for cleaning purposes and at the same time maintains said fixed relation between said horizontally disposed annular member and said upper cone portion, and placing said casing in operative po-- sition on said reservoir establishes a centered re,- lation of said horizontally disposed annular member and said upper cone portion with said burner, said loosely connecting means including a vertically disposed tubular element rigidly connected with said upper cone portion and said horizontal ly disposed annular member and extending with a loose fit through the opening in said partition, a flange extending outwardly from the upper portion of said tubular element above said partition, retaining means carried by said partition and extending in spaced relation over said flange and limiting movement of said flange upwardly from said partition, and a hinge connection between said casing and said reservoir limiting movement of said casing relatively to said reservoir to arouate movement.

12. In a stove for heating purposes, the combination of a vertical tubular casing having discharge openings through its upper portion for products of combustion, a liquid fuel burner of the annular flame type at the lower portion of the casing and including a frame and means for supplying inner air to the burner flame and including also annular burner cone means for supplying outer air to the burner flame, a liquid fuel reservoir supporting said burner and said casing, said burner cone means including separable upper and lower annular portions closely engaging each other in use and in use comprising in effect a single burner cone structure, said upper cone portion being readily removable from said lower cone portion for cleaning purposes, an imperiorate partition attached to and extending inwardly from the lower portion of said casing and having a central opening substantially larger than the burner, said stove casing being movable away from said reservoir for cleaning purposes,

ahorizontally disposed annular member spaced above and rigidly secured to said upper cone portion and defining between said annular member and said upper cone portion an annular auxiliary gair passage of fixed size and at its outer edge open to atmosphere below said partition, means loosely connecting said upper cone portion and said horizontally disposed annular member with said partition and thereby supporting the same from said partition when said casing is moved to a position away from said reservoir, means supporting said lower cone portion from the frame of the burner and thereby providing a sta,-'

tionary support for said lower cone portion, said upper cone portion having a central opening which in use surrounds the burner and is of a size supplying in use optimum outer air to the burner flame, said lower cone portion having for cleaning purposes a central opening substantially larger than the central opening in said upper 1 and at least as large as the opening in said upper cone portion, said cone portions having in; use

gara es 1'1 interengaging conformations centering the opening in saidupper cone portion relatively to the burner with said cone poitions iclosely engaging each other,;whereby moving said; casing away from said reservoir moves said horizontally disposed annular member and said upper con'e portion away from said lower con'e 'portion andaffords ready access to the burner through said lower 'con-portion for-cleaning purposes and at thesame-timemaintains saidflxed relation between {said horizontally disposed annular memberand said-upper coneportio'ri, and placing said casing" in [operative position on said reservoir establishes-a centered relation of said horizontally disposed annularmember'and said upper cone portion, with said burner, said loosely connecting means including a first tub"'lar element depending "from'tne'opening "insa'id" partition, a second tubular element rigidly connected with said upper cone portion and said horizontally disposed annular member and extending upwardly with a loose fit through said first tubular element, an upper end flange extending outwardly from the upper portion of said second tubular element above said partition, and retaining means carried by said partition and extending in spaced relation over said flange and limiting movement of said flange upwardly from said partition.

13. In a stove for heating purposes, the combination of a vertical tubular casing having discharge openings through its upper portion for products of combustion, a liquid fuel burner of the annular flame type at the lower portion of the casing and including a frame and means for supplying inner air to the burner flame and including also annular burner cone means for supplying outer air to the burner flame, a liquid fuel reservoir supporting said burner and said casing, said burner cone means including separable upper and lower annular portions closely engaging each other in use and in use comprising in effect a single burner cone structure, said upper cone portion being readily removable from said lower cone portion for cleaning purposes, an imperiorate partition attached to and extending inwardly from the lower portion of said casing and having a central opening substantially larger than the burner, said stove casing being movable away from said reservoir for cleaning purposes, a horizontally disposed annular member spaced above and rigidly secured to said upper cone portion and defining between said annular member and said upper cone portion an annular auxiliary air passage of 'fixed size and at its outer edge open to atmosphere below said partition, means loosely connecting said upper cone portion and said horizontally disposed annular member with said partition and thereby supporting the same from said partition when said casing is moved to a position away from said reservoir, means supporting said lower cone portion from the frame of the burner and thereby providing a stationary support for said lower cone portion, said upper cone portion having a central opening which in use surrounds the burner and is of a size supplying in use optimum outer air to the burner flame, said lower cone portion having for cleaning purposes a central opening substantially larger than the central opening in said upper cone portion, said horizontally disposed annular member having a central opening coaxial with and at least as large as the opening in said upper cone portion, said cone portions having in use interengaging conformations centering the opening in said upper cone portion relatively to the burner with said coneportio'ns closely engaging 'e'ach'othe'r, whereby 'movingsaid casing away from' saidreservoir moves said horizontally disposedannular memberand' said upper cone portion away-from said lower'coneportio'n and affords ready access to the burner" through said lower cone portion for cleaning'purp'osefs "and at the same time main-- Qtaihs said fixed relation between said horizontally disposed annular member and'said'up'per cone portion, and placing said casing inoperative po 'sition on said reservoir establishes a centered rel'ation of said horizontally disposed annular memher and "said upper cone portion with said burner, said loosely connecting means including a first tubular jel'em ent depending from the opening in said panama-a second tubular element rigidly connected with said upper cone portion and said horizontally "disposedannular member and extending tupwardlywith 'a loose fit through said first tubular element; an'u'pper end flange extending outwardly from the upper portion of said second tubular element above said partition, retaining means carried by said partition and extending in spaced relation over said flange and limiting movement of said flange upwardly from said partition, and a hinge connection between said casing and said reservoir limiting movement of said casing relatively to said reservoir to arcuate movement.

14. In a stove for heating purposes, the combination of a vertical tubular casing having discharge openings through its upper portion for products of combustion, a liquid fuel burner of the annular flame type at the lower portion of the casing and including a frame and means for supplying inner air to the burner flame and including also annular burner cone means for supplying outer air to the burner flame, a liquid fuel reservoir supporting said burner and said casing, said burner cone means including separable upper and lower annular portions closely engaging each other in use and in use comprising in effect a single burner cone structure, said upper cone portion being readily removable from said lower cone portion for cleaning purposes, an imperforate partition attached to and extending inwardly from the lower portion of said casing and having a central opening substantially larger than the burner, said stove casing being movable away from said reservoir for cleaning purposes, a horizontally disposed annular member spaced above and rigidly secured to said upper cone portion and defining between said annular member and said upper cone portion an annular auxiliary air passage of fixed size and at its outer edge open to atmosphere below said partition, means loosely connecting said upper cone portion and said horizontally disposed annular member with said partition and thereby supporting the same from said partition when said casing is moved to a position away from said reservoir, means supporting said lower cone portion from the frame of the burner and thereby providing a stationary support for said lower cone portion, said upper cone portion having a central opening which in use surrounds the burner and is of a size supplying in use optimum outer air to the burner flame, said lower cone portion having for cleaning purposes a central opening substantially larger than the central opening in said upper cone portion, said horizontally disposed annular member having a central opening coaxial with and at least as large as the opening in said upper cone portion, said cone portions having in use interengaging conformations cenwere tering the opening in said upper cone portion relatively to the burner with said cone portions closely engaging each other, whereby moving said casing awa'yfrom said reservoir moves'said horizontally disposed annular member and said up- 0 .percone portion away from said lower cone portion, and affords ready access to the burner through said lower cone portion for cleaning purposes and at the same time maintains said jfixed relation between said horizontally disposed annular member and said upper cone portion, and placing said casing in operative position on said reservoir establishes a centered relation of said horizontally disposed annular member and said upper cone portion with said burner, and a hinge connection between said casing and said reservoir limiting movement of said casing relatively to said reservoir to arcuate movement,

4 V WALTER B. ENGI-I.

CORTLAND W. DAVIS.

REFERENCES crrEn The following references are of record in the file of this patent: 3

UNITED STATES PATENTS 

